发明申请
US20150368737A1 HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH LINEPIPE HAVING TENSILE STRENGTH OF 540 MPA OR MORE
审中-公开
具有540 MPA或更高的拉伸强度的高强度钢板的热轧钢板
- 专利标题： HOT-ROLLED STEEL SHEET FOR HIGH STRENGTH LINEPIPE HAVING TENSILE STRENGTH OF 540 MPA OR MORE
- 专利标题（中）： 具有540 MPA或更高的拉伸强度的高强度钢板的热轧钢板
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申请号： US14763476申请日： 2014-01-23
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公开(公告)号： US20150368737A1公开(公告)日： 2015-12-24
- 发明人: Sota GOTO , Shunsuke TOYODA , Takatoshi OKABE , Yukihiko OKAZAKI
- 申请人： JFE STEEL CORPORATION
- 优先权： JP2013-010977 20130124
- 国际申请： PCT/JP2014/000319 WO 20140123
- 主分类号： C21D9/46
- IPC分类号： C21D9/46 ; C22C38/50 ; C22C38/48 ; C22C38/46 ; C22C38/44 ; C22C38/42 ; C22C38/28 ; C22C38/26 ; C22C38/24 ; C22C38/20 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D8/02
摘要：
A hot-rolled steel sheet for a high strength linepipe having a tensile strength of 540 MPa or more and a method for making the same. The steel sheet having a chemical composition containing, by mass %, C: 0.02% or more and 0.06% or less, Si: 0.05% or more and 0.25% or less, Mn: 0.60% or more and 1.10% or less, P: 0.008% or less, S: 0.0010% or less, Nb: 0.020% or more and 0.060% or less, Ti: 0.001% or more and 0.020% or less, Al: 0.01% or more and 0.08% or less, Ca: 0.0005% or more and 0.0050% or less, one or more selected from among Cu: 0.50% or less, Ni: 0.50% or less, Cr: 0.50% or less, Mo: 0.50% or less, and V: 0.10% or less, and the balance being Fe and inevitable impurities, in which the relationships 0.60≦CP≦0.90 and CM≦3.05 are satisfied.
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